根据实际情况填空。提示：first 第一second 第二 third 第三 fourth 第四 fifth第五)
1. The canteen is on the_____floor.
2. The library is on the_____floor.
3. The computer room is on the _____floor.
4. The music room is on the _____ floor.
5. Your teacher's office is on the _____floor.“略”